how to use increment or decrement button with text box in a

anjali khan

10y5.4k.NET

hi frnds

how to use increment or decrement button with text box in asp.net by csharp corner

using plus or minus button..

14 Replies

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Ranjit Powar10y ago
Accepted answer
int value;
if(int.tryParse(textBox1.Text, out value))
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}

value--;
if(value==0)
value=0;
textBox1.Text=value.ToString();
Natasha Asyikin4y ago
Increment :

protected void btn_add_Click(object sender, EventArgs e)
{
string initial;
int increment;
int quantity;
initial = TextBoxQty.Text;
increment = Convert.ToInt16(initial);
increment++;
TextBoxQty.Text = increment.ToString();
quantity = increment;
}

Decrement:

protected void btn_minus_Click(object sender, EventArgs e)
{
string initial;
int decrement;
int quantity;
if (Convert.ToInt64(TextBoxQty.Text) != 1)
{
initial = TextBoxQty.Text;
decrement = Convert.ToInt16(initial);
decrement--;
TextBoxQty.Text = decrement.ToString();
quantity = decrement;
}
else
{
TextBoxQty.Text = "1";
}
}
anjali khan10y ago
i got it if (value <= 0)
anjali khan10y ago
now also taking same like negative values
anjali khan10y ago
// hi frnds // now i want in this code if i select the decrement value it is taking negative value also but dont want negative values
anjali khan10y ago
Hi Ranjith,
thanks for the update.. this code is working properly.. thank u so much,,,
Ranjit Powar10y ago
int value;
if(int.tryParse(textBox1.Text, out value))
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}
value++;
textBox1.Text=value.ToString();

For decrement

int value;
if(int.tryParse(textBox1.Text, out value))
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}

value--;
textBox1.Text=value.ToString();
anjali khan10y ago
hi Ranjit thanks for the update as on time but now i m getting error like Error 2 ) expected Error 4 ; expected Error 5 ; expected Error 7 ; expected Error 8 ; expected Error 10 ; expected Error 6 Invalid expression term ')' Error 1 Invalid expression term ',' Error 9 Invalid expression term 'else' Error 3 Invalid expression term 'out'
Ranjit Powar10y ago
Hi I checked the link. If there is no value in textbox then it is consider as 0. You can try this

int value;
if(int.tryParse(textBox1.Text),out value)
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}
value++;
textBox1.Text=value.ToString();

For decrement

int value;
if(int.tryParse(textBox1.Text),out value)
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}

value--;
textBox1.Text=value.ToString();
anjali khan10y ago
hi but in textbox should not there any value becz i m using this to reservation ..
pl chk this link
http://asp.syncfusion.com/demos/web/Dashboard/AirlineReservation.aspx
so there is using increment or decrement..
Ranjit Powar10y ago
Try this

In increment button click event

int value;
if(int.tryParse(textBox1.Text),out value)
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}
value++;
textBox1.Text=value.ToString();

For decrement

int value;
if(int.tryParse(textBox1.Text),out value)
{
value=Convert.ToInt32(textBox1.Text);
}
else
{
value=0;
}

value--;
textBox1.Text=value.ToString();

If it helps you select it as correct answer.
Ranjit Powar10y ago
When you click on button there should be some integer value in textbox.
anjali khan10y ago
hi
m getting error like Input string was not in a correct format.

my code is like
Ranjit Powar10y ago
If you want to increment and decremt value in textbox then use below code

In increment button click event

int value=Convert.ToInt32(textBox1.Text);
value++;
textBox1.Text=value.ToString();

For decrement

int value=Convert.ToInt32(textBox1.Text);
value--;
textBox1.Text=value.ToString();

If it helps you select it as correct answer.